<template>
  <div :class="classes">
    <slot></slot>
  </div>
</template>
<script>
  import {findComponentsDownward} from '../../utils/assist';
  import Emitter from '../../mixins/emitter';
  const prefixCls = 'oolong-checkbox-group';

  export default {
    name: 'checkboxGroup',
    mixins: [Emitter],
    props: {
      value: {
        type: Array,
        default () {
          return [];
        }
      }
    },
    data () {
      return {
        currentValue: this.value,
        childrens: []
      };
    },
    computed: {
      classes () {
        return `${prefixCls}`;
      }
    },
    mounted () {
      this.updateModel(true);
    },
    methods: {
      updateModel (update) {
        const value = this.value;
        this.childrens = findComponentsDownward(this, 'oolongCheckbox');

        if (this.childrens) {
          this.childrens.forEach(function (child) {
            child.model = value;
            if (update) {
              child.currentValue = value.indexOf(child.label) >= 0;
              child.group = true;
            }
          });
        }
      },
      change (data) {
        this.currentValue = data;
        this.$emit('input', data);
        this.$emit('on-change', data);
        this.dispatch('oolongFormItem', 'on-form-change', data);
      }
    },
    watch: {
      value () {
        this.updateModel(true);
      }
    }
  };
</script>
